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// check-pass pub trait Trait<'a> { type T; type U; fn foo(&self, s: &'a ()) -> &'a (); } impl<'a> Trait<'a> for () { type T = &'a (); type U = Self::T; fn foo(&self, s: &'a ()) -> &'a () { let t: Self::T = s; t } } fn main() {}